SPECTROSCOPY MCQs

SPECTROSCOPY MCQs

Which radiation has valence electron transitions?

  1. Microwave
  2. X-rays
  3. y-rays
  4. Visible

Visible

The difference between the incident and scattered frequencies in the Raman spectrum is called the

  1. Raman frequency
  2. Anti-Stoke’s line
  3. Stoke’s line
  4. P-branch

Raman frequency

How many normal modes of vibration are possible for CO2 molecule?

  1. 4
  2. 2
  3. 3
  4. 1

4

The commonly helpful and used units for wavelength is

  1. Centimeter
  2. Micrometer
  3. Nanometer
  4. All of A, B, and C

All of A, B, and C

The degree of freedom for stretching motion for non-linear (acyclic) molecules is

  1. N-1
  2. N-5
  3. N-2
  4. N-4

N-1

Which radiation has high energy?

  1. Radio waves
  2. Microwaves
  3. Visible
  4. Ultraviolet

Ultraviolet

Which radiation has high frequency?

  1. y-rays
  2. Microwaves
  3. Infrared
  4. Radio waves

y-rays

Which radiation has rotational phenomenon?

  1. Microwave
  2. Infrared
  3. X-rays
  4. Visible

Microwave

Which radiation has vibrational transitions?

  1. Infrared
  2. y-rays
  3. Microwave
  4. X-rays

Infrared

Which molecule is not symmetric top?

  1. H₂O
  2. BCI3
  3. CH3CI
  4. BF3

H₂O

When all the three principal moments of inertia of a molecule are equal, it is called

  1. Symmetric top
  2. Prolate symmetric top
  3. Asymmetric top
  4. Spherical top

Spherical top

Which information is spectra of a obtained from rotational molecule?

  1. Molecular structure
  2. Dipole moment
  3. Atomic mass
  4. All of A, B, and C

All of A, B, and C

Which technique is helpful and used for functional group identification?

  1. FTIR spectroscopy
  2. Electronic spectroscopy
  3. NMR spectroscopy
  4. Rotational spectroscopy

FTIR spectroscopy

The source of radiation in rotational spectroscopy is

  1. Klystron valve
  2. Deuterium lamp.
  3. Sodium lamp
  4. Tungsten lamp

Klystron valve

Rotational spectra is observed in which region?

  1. Near infrared region
  2. Ultraviolet region
  3. Visible region
  4. Far infrared region

Far infrared region

Which relationship is true regarding molecular energy levels?

  1. E(vibrational) > E(electronic) > E(rotational)
  2. E(rotational) > E(vibrational) > E(electronic)
  3. E(electronic) > E(rotational) > E(vibrational)
  4. E(electronic) > E(vibrational) > E(rotational)

E(electronic) > E(vibrational) > E(rotational)

The selection rule for the transition in rotational energy levels in the Raman spectrum is

  1. ∆J = ±2
  2. ∆J = +1
  3. ∆J = +2
  4. ∆J = ±1

∆J = ±2

Which radiation has longer wavelength?

  1. Radio wave
  2. Ultraviolet
  3. Microwave
  4. Gamma rays

Radio wave

What types of energy is possessed by molecules in the gases state?

  1. Translational energy
  2. Vibrational energy
  3. Rotational energy
  4. All of A, B, and C

All of A, B, and C

Which molecule is inactive?

  1. N₂
  2. CO
  3. H₂O
  4. HC ≡ CH

N₂

How normal modes of vibration are possible for NH, molecule?

  1. 6
  2. 3
  3. 4
  4. 2

6

Which molecules do not show microwave spectrum?

  1. Spherical tops
  2. Symmetric tops
  3. Linear molecules
  4. Asymmetry tops

Spherical tops

The range of finger print region in IR spectroscopy is

  1. 4000-600 cm-1
  2. 4000-1450 cm-1
  3. 1450-500 cm-1
  4. None of A, B, and C

1450-500 cm-1

What is the source of light IR spectroscopy?

  1. Nernst filament
  2. Tungsten lamp
  3. Electron beam
  4. Deuterium lamp

Nernst filament

The detector helpful and used in IR spectroscopy is

  1. Photocell
  2. Bolometer
  3. UV detector
  4. None of A, B, and C

Bolometer

The energy associated with photon of light is  ____ .

  1. c = vλ
  2. E=hc
  3. E=mc2
  4. E= hu

E= hu

The prism/monochromator spectroscopy is made up of

  1. KBr
  2. KCI
  3. CsCl
  4. CaCl2

KBr

The selection rule for transition in vibrational energy levels in IR spectrum is

  1. ∆v = ±4
  2. ∆v = ±2
  3. ∆v = ±3
  4. ∆v = ±1

∆v = ±1

Which of the spectrum arises when an electron jumps from one energy level to another?

  1. Electronic
  2. Vibrational
  3. Nuclear
  4. Rotational

Electronic

Normally the sample in rotational spectroscopy is in the form of

  1. Gas
  2. Liquid
  3. Solid
  4. None of A, B, and C

Gas

The rotational spectroscopy cannot be applied to detect

  1. Moment of inertia
  2. Interstellar space
  3. Molecular groupings
  4. Bond length

Molecular groupings

Which diatomic molecules will not give a rotational spectrum?

  1. N₂
  2. HF
  3. NO
  4. CO

N₂

The selection rule for transitions in rotational energy levels of a diatomic molecule is

  1. ∆J = +1
  2. ∆J = -1
  3. ∆J = ±2
  4. ∆J = ±1

∆J = ±1

The vibrational degree of freedom for linear molecules is

  1. 3N-5
  2. 3N-4
  3. 3N-6
  4. None of A, B, and C

3N-5

What is the degree of freedom for bending motion for non-linear molecules?

  1. 2N-4
  2. 2N-1
  3. 2N-2
  4. 2N-5

2N-5

What is the degree of freedom for bending motion for linear molecules?

  1. 2N-1
  2. 2N-5
  3. 2N-2
  4. 2N-4

2N-4

In vibrational spectroscopy the first overtone occurs at

  1. 2V1
  2. 4V1
  3. 3V1
  4. None of A, B, and C

2V1

In vibrational spectroscopy the second overtone occurs at

  1. 2V1
  2. 4V1
  3. 3V1
  4. None of A, B, and C

3V1

Which bands arise simply from addition of two or more fundamentals or overtones in IR?

  1. Overtones
  2. Difference band
  3. Addition bands
  4. Subtraction bands

Addition bands

Which is not an addition band?

  1. V1 – V₂
  2. 2V1 + V2
  3. V1 + V ₂ + V3
  4. V1 + V2

V1 – V₂

The vibrational degree of freedom for non-linear molecules is

  1. 3N-6
  2. 3N-5
  3. 3N-4
  4. None of A, B, and C

3N-6

When two vibrational frequencies resonate and exchange energy, the phenomenon is called _____ .

  1. Fermi-resonance
  2. Stark effect
  3. Conjugation
  4. Zeeman effect

Fermi-resonance

Which is true about skeletal vibrations?

  1. They usually fall in the range of 1400-700 cm-1
  2. They arise from linear structures
  3. They arise from branched chain structures
  4. All of A, B, and C

All of A, B, and C

The detector helpful and used rotational spectroscopy is

  1. Photocell
  2. Conductivity detector
  3. Radio receiver
  4. Bolometer

Radio receiver

The range of functional group region in IR spectroscopy is

  1. 4000-1450 cm-1
  2. 2000-500 cm-1
  3. 4000-600 cm-1
  4. None of A, B, and C

4000-1450 cm-1

Which is not a difference band?

  1. V1 – V₂
  2. 2V1 + V2
  3. V1 + V₂ + V3
  4. V1 + V2

V1 + V2

More Physical Chemistry MCQs

  1. PHYSICAL CHEMISTRY MCQs
  2. CHEMICAL AND IONIC EQUILIBRIA MCQs
  3. NUCLEAR CHEMISTRY MCQs
  4. CHEMICAL THERMODYNAMICS MCQs
  5. NANOCHEMISTRY MCQs
  6. CHEMICAL KINETICS MCQs
  7. SURFACE CHEMISTRY MCQs
  8. COLLOIDAL STATE MCQs
  9. ELECTROCHEMISTRY MCQs
  10. SPECTROSCOPY MCQs
  11. SOLUTION CHEMISTRY AND PHASE EQUILIBRIA MCQs
  12. PHOTOCHEMISTRY AND MOLECULAR SYMMETRY MCQs
  13. CHEMISTRY MCQs From all subjects of  Chemistry

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